파이썬 PDF 강력하게 사용하기

[

powerful python pdf

1. Introduction to Python

Python is a popular programming language known for its simplicity and readability. It is widely used in various domains, including web development, data analysis, machine learning, and more. Whether you are a beginner or an experienced programmer, Python is a great language to learn and master. In this tutorial, we will cover the basics of Python programming and provide you with detailed, step-by-step explanations along with executable sample codes.

2. Getting Started

To start using Python, you need to have it installed on your computer. You can download the latest version of Python from the official website (python.org). Once you have installed Python, you can open the Python interpreter or use an Integrated Development Environment (IDE) such as PyCharm or Jupyter Notebook to write and run your Python code.

3. Variables and Data Types

In Python, variables are used to store values. Unlike other programming languages, Python does not require specifying the variable type explicitly. Python automatically detects the type based on the value assigned to the variable. Here are some commonly used data types in Python:

• Integers: Used to represent whole numbers (e.g., 1, 2, -5).
• Floats: Used to represent decimal numbers (e.g., 3.14, -0.5).
• Strings: Used to represent text (e.g., “Hello, World!”).
• Lists: Used to store multiple values (e.g., [1, 2, 3]).
• Dictionaries: Used to store key-value pairs (e.g., {“name”: “John”, “age”: 25}).

4. Control Flow

Python provides several control flow statements to make decisions and repeat code blocks. These include if-else statements, for loops, and while loops.

# Example of if-else statement
x = 10
if x > 0:
    print("Positive number")
elif x < 0:
    print("Negative number")
else:
    print("Zero")

# Example of for loop
numbers = [1, 2, 3]
for num in numbers:
    print(num)

# Example of while loop
count = 0
while count < 3:
    print("Count:", count)
    count += 1

5. Functions

Functions in Python allow you to encapsulate a piece of code that can be reused multiple times. You can define your own functions using the def keyword. Here is an example:

def say_hello():
    print("Hello, World!")

# Call the function
say_hello()

6. Modules and Packages

Python provides a rich collection of modules and packages that extend its functionality. You can import these modules and use their predefined functions and classes in your code. For example, the math module provides various mathematical functions, and the os module allows you to interact with the operating system.

# Example of using the math module
import math

radius = 2
area = math.pi * math.pow(radius, 2)
print("Area:", area)

# Example of using the os module
import os

current_directory = os.getcwd()
print("Current Directory:", current_directory)

Conclusion

Python is a powerful programming language with a wide range of applications. In this tutorial, we provided an introduction to Python and covered the basics of variables and data types, control flow, functions, and modules. We also included detailed, step-by-step sample codes for better understanding and provided explanations for each code snippet. By mastering Python, you can unlock many opportunities in the world of programming. Happy coding!